https://www.vetsurgeon.org/f/clinical-questions/20585/persistant-urachal-cyst-in-13-year-old-cat Just for interest really. We have a 13 year old, DSH, FN cat that has a 12 month history of chronic diarrhoea which has been variably responsive to dietary management and there was a history of spurious diagnosis of idiopathic cystitis from the previousen-USTelligent Community 10https://www.vetsurgeon.org/thread/124160?ContentTypeID=1Mon, 10 Nov 2014 08:53:30 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:ed94685b-e2d3-46d3-a4e5-bc086ab33f4dMartin Atkinson<p>[quote user=&quot;Tim Charlesworth&quot;]....it may have been particularly prominent in your cat given the failure of the urachus to regress normally or it may just be that you were looking at the area extra-carefully![/quote]Thanks for your reply. The cat is now fine and asymptomatic and has a happy owner who was expecting the worst. It never ceases to surprise me how animals continue to urinate normally with little or no increased frequency of micturition after they&#39;ve lost half their bladder. I guess there is a large reserve capacity.</p> <p>Given I wasn&#39;t expecting a urachal cyst, the vestigial urachal ligament was assumed to have been some adhesion from previous surgery, most likely neutering. Although as my knowledge of anatomy is based on &#39;what you find is what you&#39;ve got&#39;, I just double checked it wasn&#39;t some sort of weird ureter before I chopped through it. Only hindsight made it obvious what it was.</p><div style="clear:both;"></div>https://www.vetsurgeon.org/thread/124157?ContentTypeID=1Sun, 09 Nov 2014 21:34:47 GMT146601cc-3922-4be7-9974-7e1d4e45a66b:889027c1-f152-4ba5-9953-75abf49bf068Tim Charlesworth<p>Hi Martin, sounds like an interesting case. Personally I only have seen a couple of urachal diverticulae which caused the more typical signs or cystitis/contributed to FLUTD. I&#39;m sure resection will be curative. The attachment from the bladder to abdominal midline may have just been the urachal or &quot;umbilical&quot; &nbsp;ligament which is a normal vestige of the embryonic urachus. Most people chop through it without noticing it&#39;s there, it may have been particularly prominent in your cat given the failure of the urachus to regress normally or it may just be that you were looking at the area extra-carefully!</p> <p>Tim</p><div style="clear:both;"></div>